Bioprospecting plant growth promoting endophytic bacteria isolated from Himalayan yew (Taxus wallichiana Zucc.)

Adhikari, Priyanka; Pandey, Anita

doi:10.1016/j.micres.2020.126536

Cited by 30 publications

(12 citation statements)

References 32 publications

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“…Many PGP endophytic microbes are widely accepted as biofertilizers, biostimulants, and biocontrol agents [ 11 , 13 , 49 ]. These microbes exert antagonistic effects by producing antibiotic compounds, lipopeptides, cell wall degrading enzymes, volatile compounds, hydrogen cyanide (HCN), and siderophores [ 50 , 51 , 52 , 53 ]. Some of these beneficial microbes aggregate the soil particles to improve the soil structure and secrete extracellular metabolites to augment the breakdown of complex organic material and insoluble nutrients into simple, more available forms [ 54 ].…”

Section: Plant Microbiomes: the Origin Of Plant Probiotic Bacteriamentioning

confidence: 99%

Probiotic Endophytes for More Sustainable Banana Production

et al. 2021

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Climatic factors and pathogenic fungi threaten global banana production. Moreover, bananas are being cultivated using excessive amendments of nitrogen and pesticides, which shift the microbial diversity in plants and soil. Advances in high-throughput sequencing (HTS) technologies and culture-dependent methods have provided valuable information about microbial diversity and functionality of plant-associated endophytic communities. Under stressful (biotic or abiotic) conditions, plants can recruit sets of microorganisms to alleviate specific potentially detrimental effects, a phenomenon known as “cry for help”. This mechanism is likely initiated in banana plants infected by Fusarium wilt pathogen. Recently, reports demonstrated the synergistic and cumulative effects of synthetic microbial communities (SynComs) on naturally occurring plant microbiomes. Indeed, probiotic SynComs have been shown to increase plant resilience against biotic and abiotic stresses and promote growth. This review focuses on endophytic bacterial diversity and keystone taxa of banana plants. We also discuss the prospects of creating SynComs composed of endophytic bacteria that could enhance the production and sustainability of Cavendish bananas (Musa acuminata AAA), the fourth most important crop for maintaining global food security.

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Section: Plant Microbiomes: the Origin Of Plant Probiotic Bacteriamentioning

confidence: 99%

Probiotic Endophytes for More Sustainable Banana Production

et al. 2021

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“…The endophytic microflora has a massive diversity in context to antibiotic sensitivity. Even the candidates from the sole genus behave erratically to a specific antibiotic 51 , 52 . T heir behavior towards antibiotics like rifampicin, erythromycin, polymyxin-B, and amikacin has been observed similarly earlier 53 .…”

Section: Discussionmentioning

confidence: 99%

Dynamics, phylogeny and phyto-stimulating potential of chitinase synthesizing bacterial root endosymbiosiome of North Western Himalayan Brassica rapa L.

Padder

Rather

Bhat

et al. 2022

Sci Rep

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The less phytopathogen susceptibility in Himalayan Brassica rapa L. has made it an exceptional crop eluding synthetic pesticide inputs, thereby guarantying economically well-founded and ecologically sustainable agriculture. The relevance of niche microflora of this crop has not been deliberated in this context, as endosymbiosiome is more stable than their rhizosphere counterparts on account of their restricted acquaintance with altering environment; therefore, the present investigation was carried out to study the endophytic microfloral dynamics across the B. rapa germplasm in context to their ability to produce chitinase and to characterize the screened microflora for functional and biochemical comportments in relevance to plant growth stimulation. A total of 200 colonies of bacterial endophytes were isolated from the roots of B. rapa across the J&K UT, comprising 66 locations. After morphological, ARDRA, and sequence analysis, eighty-one isolates were selected for the study, among the isolated microflora Pseudomonas sp. Bacillus sp. dominated. Likewise, class γ-proteobacteria dominated, followed by Firmicutes. The diversity studies have exposed changing fallouts on all the critical diversity indices, and while screening the isolated microflora for chitinase production, twenty-two strains pertaining to different genera produced chitinase. After carbon source supplementation to the chitinase production media, the average chitinase activity was significantly highest in glycerol supplementation. These 22 strains were further studied, and upon screening them for their fungistatic behavior against six fungal species, wide diversity was observed in this context. The antibiotic sensitivity pattern of the isolated strains against chloramphenicol, rifampicin, amikacin, erythromycin, and polymyxin-B showed that the strains were primarily sensitive to chloramphenicol and erythromycin. Among all the strains, only eleven produced indole acetic acid, ten were able to solubilize tricalcium phosphate and eight produced siderophores. The hydrocyanic acid and ammonia production was observed in seven strains each. Thus, the present investigation revealed that these strains could be used as potential plant growth promoters in sustainable agriculture systems besides putative biocontrol agents.

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“…Instead, taxa capable of siderophore production under Fe-limited conditions may prove more effective. Siderophore-producing microbes isolated from the soils of montane forest ecosystems are not only capable of increasing Fe availability and acquisition but can do so even when exposed to extreme envi-ronmental stress [57,58]. Although research into the utilisation of these microbial species as biofertilizers only began in the last decade, preliminary results indicate significant potential for their application in combatting Fe deficiency in arable crops [57,58].…”

Section: Fe In Natural Ecosystemsmentioning

confidence: 99%

“…Given the clear requirements of soil microorganisms for both micronutrients, bioprospecting in natural ecosystems could yield microbial taxa suitable for application as biofertilizers [109,114,115]. Studies relating to the microbial usage and mobilization of B in natural ecosystems are limited and have yet to yield B-mobilizing microbial taxa [57,58]. Research into Mo-mobilizing taxa in natural ecosystems is also limited, but it is possible that free-living, N-fixing microbes in forest soils are capable of releasing chelating agents to acquire Mo for nitrogenase production [116], and there is evidence that Azotobacter vinelandii produces a Mo-chelating siderophore or 'molybdophore' [117].…”

Section: B and Mo In Natural Ecosystemsmentioning

confidence: 99%

Micronutrients in Food Production: What Can We Learn from Natural Ecosystems?

Denton-Thompson

Sayer

2022

Soil Systems

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Soil micronutrients limit crop productivity in many regions worldwide, and micronutrient deficiencies affect over two billion people globally. Microbial biofertilizers could combat these issues by inoculating arable soils with microorganisms that mobilize micronutrients, increasing their availability to crop plants in an environmentally sustainable and cost-effective manner. However, the widespread application of biofertilizers is limited by complex micronutrient–microbe–plant interactions, which reduce their effectiveness under field conditions. Here, we review the current state of seven micronutrients in food production. We examine the mechanisms underpinning microbial micronutrient mobilization in natural ecosystems and synthesize the state-of-knowledge to improve our overall understanding of biofertilizers in food crop production. We demonstrate that, although soil micronutrient concentrations are strongly influenced by soil conditions, land management practices can also substantially affect micronutrient availability and uptake by plants. The effectiveness of biofertilizers varies, but several lines of evidence indicate substantial benefits in co-applying biofertilizers with conventional inorganic or organic fertilizers. Studies of micronutrient cycling in natural ecosystems provide examples of microbial taxa capable of mobilizing multiple micronutrients whilst withstanding harsh environmental conditions. Research into the mechanisms of microbial nutrient mobilization in natural ecosystems could, therefore, yield effective biofertilizers to improve crop nutrition under global changes.

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Bioprospecting plant growth promoting endophytic bacteria isolated from Himalayan yew (Taxus wallichiana Zucc.)

Cited by 30 publications

References 32 publications

Probiotic Endophytes for More Sustainable Banana Production

Probiotic Endophytes for More Sustainable Banana Production

Dynamics, phylogeny and phyto-stimulating potential of chitinase synthesizing bacterial root endosymbiosiome of North Western Himalayan Brassica rapa L.

Micronutrients in Food Production: What Can We Learn from Natural Ecosystems?

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